Sanitary hot water production from heat recovery in hotel buildings in Cuba

Abstract

In tropical countries Heating, Ventilation and Air Conditioning (HVAC) systems are commonly used in tourism facilities to maintain comfort, but with considerable electricity consumption. Much attention had been paid to improving efficiency and saving energy in the thermal systems of hotels, e.g. air conditioning and sanitary hot water (SHW). This work is about energy modeling of a conventional vapor compression system with condensation heat recovery for sanitary hot water production in Cuba. The model estimates the total amount of heat rejected in the condenser from measurable external variables, such as: electric power, ambient temperature and chilled water temperature. The system is evaluated under partial load conditions duringwinter, when temperatures are low and therefore the demand for cooling is less, while hot water is used for rooms or kitchen services. The results show that the model is valid for actual operating conditions working below its nominal capacity.

Keywords

• chiller
• heat recovery
• hotels
• sanitary hot water
• thermodynamic modeling.